http://www.google.com/search?hl=en&l...22&btnG=Search
is an example of why this doesn't work for anything other than a parlor trick... It should be finding their page PR9, instead it doesn't know what I am talking about.
About the only thing it would be good for is selling a site with a PR7 and then hoping the idiot who baught it doesn't figure it out and move to have you arrested.